提出一种盲接收环境下的慢跳频(SFH)系统频率跳变时刻同步算法。该算法针对慢跳频系统中1跳数据包含多个调制符号的特征，通过非线性变换得到包含离散谱线的信号。利用跳频信号在每1跳内能量恒定的特性，将1跳信号均匀划分为2段，提取分段信号非线性变换后离散谱线能量差异，作为调整频率跳变时刻的判决量，通过反馈环路实现盲接收环境下频率跳变时刻的精确同步。对典型慢跳频DPSK(SFH/DPSK)系统在盲接收环境下的同步性能进行仿真，在Eb/N0大于16 dB时，算法同步性能接近10-3，验证了算法的有效性。%A frequency hopping signals hop timing synchronization algorithm for Slow Frequency Hopping(SFH) system is proposed. Considering that the slow frequency hopping system has more than one symbol in a single hop, non-linear transform is used to generate the spectrum lines. Considering the energy in each hop is constant, a single hop is equally divided into two segments, and the energy difference of the spectrum lines between these segments is used to decide whether the hop timing is early or late. Then, a feedback loop is used to adjust the hop timing and make the system be synchronized. The hop timing performance is verified by computer simulation in a typical SFH/DPSK blind-receiving environment. The synchronization error is about 10-3 while Eb/N0 is more than 16 dB.
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